package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面 实现公共字段的自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) {
        log.info("开始进行公共字段的填充....");
//        获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature(); //方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获得方法上的注解
        OperationType operationType = autoFill.value(); //获取数据库操作类型
//        获取当前被拦截对象的参数---实体对象
        Object[] joinPointArgs = joinPoint.getArgs();
        if (joinPointArgs == null || joinPointArgs.length == 0) {
            return;
        }
        Object enity = joinPointArgs[0];
//         获取赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
//        根据不同的数据类型,给对应的属性通过反射来进行赋值
        if (operationType == OperationType.INSERT) {
//        为四个字段赋值
            try {
                Method setCreateTime = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
//                通过反射为对象属性赋值
                setCreateTime.invoke(enity, now);
                setCreateUser.invoke(enity, currentId);
                setUpdateTime.invoke(enity, now);
                setUpdateUser.invoke(enity, currentId);
            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = enity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
//                通过反射为对象属性赋值
                setUpdateTime.invoke(enity, now);
                setUpdateUser.invoke(enity, currentId);
            } catch (NoSuchMethodException e) {
                throw new RuntimeException(e);
            } catch (IllegalAccessException e) {
                throw new RuntimeException(e);
            } catch (InvocationTargetException e) {
                throw new RuntimeException(e);
            }
        }
    }
}
